[GNC] How to create a Transaction Report subtotaled by Payer?

[Tom Route36]

Hi all,

I get monthly interest payments from around a dozen different payers.  
In GnuCash each such monthly payment gets recorded against an "Interest 
Income" account.  I want to create a report that lists all of these 
interest payments to me transaction by transaction.  If I do a 
Transaction Report for my "Interest Income" account I get a 
chronological list of these interest payments (Date, Num, Description, 
Memo/Notes, Transfer from/to, Debit, Credit).  And at the bottom of the 
report I get the total amount of all those payments combined.  That's great.

But what I really want is to get that same transaction-by-transaction 
data in a report that's subtotaled by Payer.  Something like this:
==========
Bank AA:
   Date, Description, Credit
   Date, Description, Credit
   Date, Description, Credit
      Total Bank AA:  Sub-total Credits

Bank BB:
   Date, Description, Credit
   Date, Description, Credit
   Date, Description, Credit
      Total Bank BB:  Sub-total Credits

Bank CC:
   Date, Description, Credit
   Date, Description, Credit
   Date, Description, Credit
      Total Bank CC:  Sub-total Credits

Total for all payers:  Total Credits
==========

With Quicken this was straightforward.  Do a Transaction report for 
Interest Income subtotaled by Account.  But in GnuCash I can't seem to 
figure out how to get a similar subtotaled report.  Is there a way to do 
this?  Any help would be appreciated.

Tom